docs: 📝 add what this course will cover (#36)

## Description

Closes #13 

## Reviewer Focus

This PR needs an in-depth review. 

## Checklist

- [X] Ran spell-check
- [X] Formatted Markdown
- [ ] Rendered website locally

preamble/syllabus.qmd

@@ -26,4 +26,21 @@ In addition to the assumptions, we also have a fairly focused scope for
 teaching and expectations for learning. So this may also help you decide
 if this course is for you.
 
--   List of what we will teach and won't teach
+This course will cover:
+
+-   Using Git
+
+-   Using GitHub
+
+-   Working with at least one other person
+
+-   Using \<IDE\>
+
+-   Working with plain text files (as Markdown `.md` )
+
+This course will **NOT** cover:
+
+-   Using any programming language (like R or Python)
+
+-   Any project management, for example related to tasks/issues (even
+    though we briefly cover issues)